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US4921419A - Hydraulic press - Google Patents

Hydraulic press Download PDF

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Publication number
US4921419A
US4921419A US07/310,458 US31045889A US4921419A US 4921419 A US4921419 A US 4921419A US 31045889 A US31045889 A US 31045889A US 4921419 A US4921419 A US 4921419A
Authority
US
United States
Prior art keywords
hydraulic
shock absorber
countersupport
cylinder
piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/310,458
Other languages
English (en)
Inventor
Richard Brussel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Umformtechnik Erfurt GmbH
Original Assignee
Fried Krupp AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fried Krupp AG filed Critical Fried Krupp AG
Assigned to FRIED. KRUPP GESELLSCHAFT MIT BESCHRANKTER HAFTUNG, ALTENDORFER STRASSE 103, D-4300 ESSEN 1, FED. REP. OF GERMANY reassignment FRIED. KRUPP GESELLSCHAFT MIT BESCHRANKTER HAFTUNG, ALTENDORFER STRASSE 103, D-4300 ESSEN 1, FED. REP. OF GERMANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BRUSSEL, RICHARD
Application granted granted Critical
Publication of US4921419A publication Critical patent/US4921419A/en
Assigned to UMFORMTECHNIK ERFURT GMBH reassignment UMFORMTECHNIK ERFURT GMBH ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FRIED. KRUPP GMBH
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0052—Details of, or accessories for, presses; Auxiliary measures in connection with pressing for fluid driven presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/24—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam
    • B30B15/245—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam using auxiliary cylinder and piston means as actuating members
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/047—Seal ring

Definitions

  • the present invention relates to a device for braking the movable press plate and the plunger in a hydraulic press employed particularly for the mold-pressing of fiber reinforced synthetic materials.
  • the press plate is guided laterally and includes spindles (abutment members) attached thereto which act on and are braked by at least two countersupport cylinder units mounted on the stationary press table or the press stand.
  • Presses have therefore been developed in which, after the driven plunger moves the press plate with a rapid closing speed, countersupport cylinder units brake the plunger and the press plate while simultaneously aligning the final pressing movement of the press plate.
  • countersupport cylinder units brake the plunger and the press plate while simultaneously aligning the final pressing movement of the press plate.
  • the velocity of the press plate must be reduced to almost zero so as to permit a force-transmitting and/or form-locking connection between the spindles mounted on the press plate and the countersupport units mounted on the press stand. This occurrence, however, may involve such a delay that the advantages of a rapid closing are lost.
  • a resettable hydraulic shock absorber disposed between a respective spindle and the countersupport cylinder unit produces a braking effect on the press plate and plunger and this braking force is lower than the braking force of the countersupport cylinder unit.
  • the device according to the invention can be employed in various hydraulic press systems operating with countersupport cylinder units. It not only provides the advantage of a rapid connection of the spindle and the associated countersupport cylinder unit and effective braking of plunger and the press plate, but it also contributes to a reduction in the noise of the hydraulic press during its operation.
  • shocks caused by the impact of the press plate on the countersupport cylinder unit are reduced considerably.
  • the primary advantage of the invention is that the speed of the plunger, the press plate and the spindle, before the spindle impacts on the piston of the countersupport cylinder unit, needs to be reduced much less than in the prior art devices. Further, the speed of the damping or braking stroke is still sufficiently high to maintain the loss of time at a minimum for the subsequently required acceleration of the press plate.
  • FIGURE is a sectional elevational view illustrating a preferred embodiment of the invention.
  • FIG. 1 illustrates in section a countersupport cylinder unit which includes a countersupport cylinder 2 having a flanged end 3 and a piston 1 having one end disposed in the countersupport cylinder 2.
  • the flanged end 3 is connected by means of screws (only symbolically illustrated by dash-dot lines) and by way of a height-adjustable device (not shown) with a press table 40 of a hydraulic press.
  • four such countersupport cylinder units are arranged in such a manner that their respective vertical axes 4 are disposed in the form of a rectangle outside of the range of the pressing tool parts.
  • the hydraulic press has a vertically movable press plate 41 which is actuated by one or more plungers (piston rods) 42 of press cylinder units of the hydraulic press and which is provided with respective downwardly projecting, height-adjustable stepped abutment members 5, each being height-adjustable --for example, by means of a threaded spindle (not shown)--for adaptation to different height positions.
  • the piston 1 At its end which projects out from the countersupport cylinder 2, the piston 1 has a stepped cylindrical end 22 forming a shoulder 6.
  • An annular cylinder 7 is screwed in a sealing manner onto the end 22. That end of the cylinder 7 which is oriented away from the piston 1 is provided with an inwardly oriented flange 8 which limits the upward stroke of a damping piston 9 axially slidably received in the cylinder 7.
  • the flange 8 is an externally threaded ring whose axial position with respect to the cylinder 7 may be changed by turning the ring, thus varying the stroke length (and thus the throttling effect) of the damping piston 9.
  • the cylinder 7, the damping piston 9 and the upper radial surface 23 of the piston 1 form a shock absorber which will be described in further detail below.
  • the cylinder 7 is provided with an upwardly extending, sleeve-shaped cylindrical attachment 10 which has the same outer diameter as the cylinder 7.
  • a flat annular seal 11 is provided which is mounted to the attachment 10 between elements 24 and 25 and which serves for preventing hydraulic fluid from escaping from the volume 26 enclosed by the cylindrical attachment 10, the damping piston 9 and the annular seal 11.
  • the volume 26 acts as a reservoir for the hydraulic fluid of the shock absorber.
  • the lower, stepped portion 18 of the abutment member 5 has approximately the same diameter as the outwardly projecting end of the damping piston 9 and the upper end of portion 18 forms a shoulder 20 of the abutment 5 against which the annular seal 11 lies when the abutment 5 contacts the damping piston 9.
  • the cylinder 7 is provided with three radial bores 12 (only one is visible) which open into a relatively narrow clearance 13 formed between piston 1 and the damping piston 9 when the damping piston is in the extended or upper position.
  • the width of the clearance 13 when the damping piston 9 is in its upper position and which corresponds to the stroke of the shock absorber, is about 5 mm.
  • the damping piston diameter is about 80 mm, and this, together with the length of the stroke (height of the gap 13), determines the volume of hydraulic fluid that is displaced when the damping piston 9 is forced into contact with the upper surface 23 of the piston end 22.
  • the nipples 14 are disposed on the cylinder 7 so that passages 31 are located vertically below the annular element 24.
  • the damping piston 9 is provided with a central, stepped bore 15 in which a helical compression spring 16 is disposed and seated in a blind bore 17 formed in the piston 1.
  • the piston 1 and the damping piston 9 are shown in their upper, extended positions.
  • the stepped abutment member 5 moves downwardly, towards its illustrated position, the lower cylindrical part 18 of the abutment member 5 impacts on the upper surface of the damping piston 9 at the end of the rapid closing motion of the press plate. Since the force of the countersupport cylinder unit is set so that its force is greater than the damping force of the shock absorber 7, 9, the hydraulic fluid disposed in gap 13 is displaced through bores 12, 30 and 31 into the interior volume 26 of attachment 10 until the damping piston 9 abuts the upper surface 23 of the piston 1.
  • the countersupport cylinder unit contrary to prior art constructions, does not have to be set to its maximum holding force to counteract the abutment member 5 as it strikes the damping piston 9.
  • the damping force of the shock absorber may also be varied--in addition to or instead of the adjustable flange 8--in a simple manner by using exchangeable nozzles 19 which have different inner diameters (and thus different throttling effects) and which are screwed into the bores 12.
  • the press plate Upon completion of the downward pressing stroke, the press plate moves rapidly back into its upper end position, carrying with it the abutment member 5. This allows the helical spring 16 to push the damping piston 9 back into its upper position and the oil which was displaced from the gap 13 is now able to flow back into the gap 13 through the central bore 15.
  • An expansion bellows 21 surrounding the shock absorber is provided between the countersupport cylinder 2 and the press plate 41 so as to seal off the shock absorber from leaking any fluids near the press tool parts and from being contaminated from any material present in and around the press.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Control Of Presses (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
US07/310,458 1988-02-18 1989-02-15 Hydraulic press Expired - Fee Related US4921419A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3805004 1988-02-18
DE3805004A DE3805004C2 (de) 1988-02-18 1988-02-18 Einrichtung zum Abbremsen des Stößels einer hydraulischen Presse

Publications (1)

Publication Number Publication Date
US4921419A true US4921419A (en) 1990-05-01

Family

ID=6347624

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/310,458 Expired - Fee Related US4921419A (en) 1988-02-18 1989-02-15 Hydraulic press

Country Status (5)

Country Link
US (1) US4921419A (de)
EP (1) EP0329000B1 (de)
JP (1) JPH01249300A (de)
DE (1) DE3805004C2 (de)
ES (1) ES2035379T3 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040191360A1 (en) * 2001-08-17 2004-09-30 Michael Koch Locking unit of a three-plate injection-molding machine
US20100252948A1 (en) * 2009-04-01 2010-10-07 Andrews Albert A Method of compacting material
US7850884B2 (en) * 2009-04-01 2010-12-14 The Gillette Company Method of compacting material

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0727295A3 (de) * 1995-02-09 1997-07-09 Ewi Inc Verfahren und Vorrichtung zur Pressformen von Kunststoffen in einer mechanischen Plattenpresse
CN106825355B (zh) * 2017-03-23 2019-03-19 莱芜钢铁集团有限公司 一种联结结构及水压机

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2113115A (en) * 1934-05-25 1938-04-05 Hydraulic Press Corp Hydromechanical press
US2809542A (en) * 1953-02-17 1957-10-15 Baldwin Lima Hamilton Corp Compensating system for presses
US3997286A (en) * 1976-03-15 1976-12-14 Chicago Rawhide Manufacturing Company Molding apparatus and vacuum system therefor
US4055205A (en) * 1976-07-16 1977-10-25 Blandin Wood Products Press seal

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7207024A (de) * 1972-05-25 1973-11-27
US3932087A (en) * 1974-01-07 1976-01-13 Toolex Alpha Aktiebolag Arrangement in moulding presses with parted press tools for the production of hot-pressed plastic material products, especially grammophone records
DE2812973C2 (de) * 1978-03-23 1984-09-20 Maschinenfabrik Lauffer & Butscher, 7240 Horb Einrichtung zur Dämpfung des Schnittschlages an einer hydraulischen Presse

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2113115A (en) * 1934-05-25 1938-04-05 Hydraulic Press Corp Hydromechanical press
US2809542A (en) * 1953-02-17 1957-10-15 Baldwin Lima Hamilton Corp Compensating system for presses
US3997286A (en) * 1976-03-15 1976-12-14 Chicago Rawhide Manufacturing Company Molding apparatus and vacuum system therefor
US4055205A (en) * 1976-07-16 1977-10-25 Blandin Wood Products Press seal

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040191360A1 (en) * 2001-08-17 2004-09-30 Michael Koch Locking unit of a three-plate injection-molding machine
US6939124B2 (en) * 2001-08-17 2005-09-06 Ferromatik Milacron Maschinenbau Gmbh Locking unit of a three-plate injection-molding machine
US20100252948A1 (en) * 2009-04-01 2010-10-07 Andrews Albert A Method of compacting material
US7850884B2 (en) * 2009-04-01 2010-12-14 The Gillette Company Method of compacting material
US7959837B2 (en) * 2009-04-01 2011-06-14 The Gillette Company Method of compacting material

Also Published As

Publication number Publication date
EP0329000B1 (de) 1992-10-28
EP0329000A1 (de) 1989-08-23
DE3805004A1 (de) 1989-08-31
DE3805004C2 (de) 1996-10-31
JPH01249300A (ja) 1989-10-04
ES2035379T3 (es) 1993-04-16

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Legal Events

Date Code Title Description
AS Assignment

Owner name: FRIED. KRUPP GESELLSCHAFT MIT BESCHRANKTER HAFTUNG

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BRUSSEL, RICHARD;REEL/FRAME:005062/0697

Effective date: 19890328

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

AS Assignment

Owner name: UMFORMTECHNIK ERFURT GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:FRIED. KRUPP GMBH;REEL/FRAME:006221/0958

Effective date: 19920320

FPAY Fee payment

Year of fee payment: 4

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Lapsed due to failure to pay maintenance fee

Effective date: 19980506

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362